Electrical heat-storage device.



W M R J. T. H. DEMPSTBR.

ELECTRICAL HEAT STORAGE DEVICE.

APPLICATION FILED 00T.'7, 1912.

Patented May 27, 1913.

Dam: HIS fitter-neg WNW,

Inve ntor': John T. H. Dempster', y

Witnesses:

fizfW To all. whom it'may concern:

' UNITED STATES IATENT caries;

some '1. n. nnmps'ma, or scnsnecren r uaw -some ASSIGNOR T0 ems-snail L ELECTRIC COMPANY, A GQRP0BA-I'I6N 0F YORK.

ELHMRICAL nearest-cutie DEVIQIL.

- Be it known that 1, JOHN T. Dm n s'rm,

a citizen of the United States, residing at; Schenectady, county of Schenectady,-State f New York, hav invented certain new and useful Improvements in Electrical Heat Storage Devices of which thje following is r w a. specification.

My invention .r elates' to "electrical heat storage devices of the general characterd sclosed in Stanley Patent NO.- 1,Q25,84 =3. Y Such devices comprise means for storing-heat elec- 3 trically at a; comparatively low rateifand for 1 an extended periodof time and means for .t vly ,l aP operations.

transfer-fin heatthus storedat ax odmparainvention relates more to the means ion rapidly transferring thestored heat; 7

One: of the "objects of my i-nvention is to 1 provide adevice of thischaracterby means of which the rate of heat flow from the StQI'? a e mass maybe convenientlyregulated: According to my invention I provide a; heat transferring means "or switch eompi ising a'body havinghigh heat conductivity which preferably islada'pted to placed in contact with the storage mass'or' tohe removed therefrom fit willf. 'I- sov con- I structjthe said the'rmhl switch and that or ion of-theheat stora e egain the said switch is adapted "to; be 'placedthat certain portions of the contiguous surfgees thereof will beincontact and others will-be separatedby an insulatin (medium. I prefer to utilize the, dead alr inclo'sed by 'Ide-' pressions in said conti ous surfaces as :the insulating medium as 1t ,-isivv'ell known that dead or "confined air is agoodjheat insulator. In addition to the aforesaid construe.-

tion I provide means for varying the extent of the area of; contact between the-thermal switch and storage-mass and for. varying at the same time thearea of separation thereof. This variation is preferably secured by hav-' ing either thestorage mass or thermal switch movable with respect to the other. When the I contact area is at a maximum and the separation area at a minimum the rate of heat flow will be at 'a maximum and vice'VerSa. v My invention will be more clearly understood by referring to the accompanying drawing in which- Figure 1 is a vertical section of a storage rate tor -cooking and similar thermal switch"o r heat conducting p ate thermal 1 l9 is .composed of iron; or other material.

- Patented my 27; 1am;

stove equipped with my nventioh;Fig ..2is avertical section of the cover which'm'ay be sed in connect' n with theaforesaid stove and 'Fig. 3 is an enlarged plauview partly broken awayshowilig the; thermal switch,

, and a portion of the stggage'masso In'the aforesaiddrawing '10 is a storage mass wh ch may hoof iron or other material hav ng high heat' -storage capacityand high thermal conductivity; The said heat storage massis heated by means of the electrical res stance unit 11. The heat storage mass is surrounded by heat insulation l2 and the casing 13 which is preferably of metal. The conductors 14 of the lectrical heatingunit 7 vare "connected toan external circuit by means of a plug 15 and extend to the unit-l1 through th bushing 16." The heat storage'mas 1O p ojects a short distance above the 8114); the. casing 13. This portion of the bee ;,s orage mass is preferably frusto-conical in shape. I The curved surface 1'4 thereof is provided with aseries'of grooves hr depressions 18 'asshow-n' in Fig. 3. he

"having high 'heatconductivity. T'e"*u per surface of the said plate, is pre crab y;-

[flat although it may beat any desired sh'ape so as to make good thermal contact with {8 hooking receptacles and other bodies, 1 which it is desiredto heat. The bottom-surfaceof saidpl ate is concave and theriin portion 20 thereof is of such shape as 'tofit'c1ose1y1withi 't'he surfacel'f'of the heat storage mass. central portion 21 of the bottom surface is 'preferably concave so as to form a con'siderable space between the' said plateandl thestorage mass when the'plate is placed-in po- 1 sition' theieonfThe rim 'portion' 20s: the plate is provided with grooves or depressions 22 as. is shown. in dotted lines in-1Fig33, The said grooves'or depressions are of the same size as the grooves 18 in the heat-storage mass and are spaced apart the samedistance 'as said grooves 18.' The plate 19 is provided with'fa suitable handle 23.

The stove's provided with a cover 24; which is preferably a metal shell 25 filled with insulation 26. The bottom surface of the said" cover is recessed at 27 sothat it may fit tightly over the top of the heat storage mass when the cover is placed in position. The cover is also provided with handle 28.

The 9 In the operation oi the above described stove the heat is" stored electrically in the heat storage massat such. rate as desired;

When it is desired to utilize the stove for storage mass.

upon the thermal switch :may be-r fiow will be at a maximum. When'the solid portions of the plategregister With ffllj grooves in the heat storage massthe separati on area will be at .a maximum and rateof heat fiowwillbe ate minimum lntermedi-'- ate rates of heat flow-may be secured by causing the thermal switch to-assuine inter? mediate positions.

' Various modifications ofjthe "structure above described will readiIyocofir-zto those skilled in the "artyandare to benconsiciered. as coming within the scope; of my-inventionwhich is set forth in thefollowing'c'laiins,

"What I clairnf as new iunlfles'itoto'seoiire 'by Letters -.Patent of the United- States is v L'The combination'in an electrical heatjf storage dvioe io'f a hatstorage massa heat.

conducting body mounted, adjacent thereto,

the Contiguous surfaces of said elements" each comprisingportions'adapted to contact with those of the other element and insulate Eng Portions, and means .forv varyingvthe relative areas of contact andnsulation between said elements.

2. The combination an'ele'ctrical heat P is ns 8 storage device of a heat storage mass a part of which is surrounded by heat insulation and a heat conductin bod'y mounted upon 1anothfer'part thereof, t e contiguous surfaces Iofsaidelements each comprising portions adaptetito contact with those of the other element-and insulating portionsyand oneof jjsaid'elements bein movable to vary-the relative areas of contact and-i nsu1ation between thesamei I it 3. ffhe'c'ombinationflin an electrical; heat storage jdevice of, a heat storage mass, aheat conducting mounted adjacent-thereto, theeontiguous su rfaces of said elements each' .ihavi'nglde ressi'on's' therein and-intervening aptedfto contact with SQOII' POndv 'ing portions of 't heother element, one of said eleme ts 'beingniova'ble'lto Vary-the relative areas of contact and separation; ofisaid ele- 4. In a heatstorage dvke, a heat storage mass and a body for'conducting heat-themfrom, said elements ha'vin surfaces adapted to register and each-prowded ,With *a series of similarly spacedfdepres'sion s, the saidelements b'eingso disposed that oneof said set;

faces-is movable upon theother;

amneeemmmam in'an 'electrijcal heat g storage-device ofa *heatv-stora'ge mass and a thermal switch rotatably mounted thereon the'contig uoi s surfaces. of saidmass andfsaid f same; a Inwitness' whereof, I have hereunto set 1 my hand'this 4th day of Octobr,l912.f

JQHNT. HQDEMPSIER. WVitnesses: BENJAMIN B. HULL,-" HELEN ()nronp.

Copies of this patent may be obtalnedjor five centsea ch, by addressing the Commissioner 01 Patents,

- r Washington, D. 0. k

switch being similarly :groovedso 'asfto-foi'ni cont-(rot. and separation; areasbetween" v the. 

